libzfs_import.c revision 278177
1/* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22/* 23 * Copyright 2015 Nexenta Systems, Inc. All rights reserved. 24 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 25 * Copyright (c) 2013 by Delphix. All rights reserved. 26 */ 27 28/* 29 * Pool import support functions. 30 * 31 * To import a pool, we rely on reading the configuration information from the 32 * ZFS label of each device. If we successfully read the label, then we 33 * organize the configuration information in the following hierarchy: 34 * 35 * pool guid -> toplevel vdev guid -> label txg 36 * 37 * Duplicate entries matching this same tuple will be discarded. Once we have 38 * examined every device, we pick the best label txg config for each toplevel 39 * vdev. We then arrange these toplevel vdevs into a complete pool config, and 40 * update any paths that have changed. Finally, we attempt to import the pool 41 * using our derived config, and record the results. 42 */ 43 44#include <ctype.h> 45#include <devid.h> 46#include <dirent.h> 47#include <errno.h> 48#include <libintl.h> 49#include <stddef.h> 50#include <stdlib.h> 51#include <string.h> 52#include <sys/stat.h> 53#include <unistd.h> 54#include <fcntl.h> 55#include <thread_pool.h> 56#include <libgeom.h> 57 58#include <sys/vdev_impl.h> 59 60#include "libzfs.h" 61#include "libzfs_impl.h" 62 63/* 64 * Intermediate structures used to gather configuration information. 65 */ 66typedef struct config_entry { 67 uint64_t ce_txg; 68 nvlist_t *ce_config; 69 struct config_entry *ce_next; 70} config_entry_t; 71 72typedef struct vdev_entry { 73 uint64_t ve_guid; 74 config_entry_t *ve_configs; 75 struct vdev_entry *ve_next; 76} vdev_entry_t; 77 78typedef struct pool_entry { 79 uint64_t pe_guid; 80 vdev_entry_t *pe_vdevs; 81 struct pool_entry *pe_next; 82} pool_entry_t; 83 84typedef struct name_entry { 85 char *ne_name; 86 uint64_t ne_guid; 87 struct name_entry *ne_next; 88} name_entry_t; 89 90typedef struct pool_list { 91 pool_entry_t *pools; 92 name_entry_t *names; 93} pool_list_t; 94 95static char * 96get_devid(const char *path) 97{ 98#ifdef have_devid 99 int fd; 100 ddi_devid_t devid; 101 char *minor, *ret; 102 103 if ((fd = open(path, O_RDONLY)) < 0) 104 return (NULL); 105 106 minor = NULL; 107 ret = NULL; 108 if (devid_get(fd, &devid) == 0) { 109 if (devid_get_minor_name(fd, &minor) == 0) 110 ret = devid_str_encode(devid, minor); 111 if (minor != NULL) 112 devid_str_free(minor); 113 devid_free(devid); 114 } 115 (void) close(fd); 116 117 return (ret); 118#else 119 return (NULL); 120#endif 121} 122 123 124/* 125 * Go through and fix up any path and/or devid information for the given vdev 126 * configuration. 127 */ 128static int 129fix_paths(nvlist_t *nv, name_entry_t *names) 130{ 131 nvlist_t **child; 132 uint_t c, children; 133 uint64_t guid; 134 name_entry_t *ne, *best; 135 char *path, *devid; 136 int matched; 137 138 if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_CHILDREN, 139 &child, &children) == 0) { 140 for (c = 0; c < children; c++) 141 if (fix_paths(child[c], names) != 0) 142 return (-1); 143 return (0); 144 } 145 146 /* 147 * This is a leaf (file or disk) vdev. In either case, go through 148 * the name list and see if we find a matching guid. If so, replace 149 * the path and see if we can calculate a new devid. 150 * 151 * There may be multiple names associated with a particular guid, in 152 * which case we have overlapping slices or multiple paths to the same 153 * disk. If this is the case, then we want to pick the path that is 154 * the most similar to the original, where "most similar" is the number 155 * of matching characters starting from the end of the path. This will 156 * preserve slice numbers even if the disks have been reorganized, and 157 * will also catch preferred disk names if multiple paths exist. 158 */ 159 verify(nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &guid) == 0); 160 if (nvlist_lookup_string(nv, ZPOOL_CONFIG_PATH, &path) != 0) 161 path = NULL; 162 163 matched = 0; 164 best = NULL; 165 for (ne = names; ne != NULL; ne = ne->ne_next) { 166 if (ne->ne_guid == guid) { 167 const char *src, *dst; 168 int count; 169 170 if (path == NULL) { 171 best = ne; 172 break; 173 } 174 175 src = ne->ne_name + strlen(ne->ne_name) - 1; 176 dst = path + strlen(path) - 1; 177 for (count = 0; src >= ne->ne_name && dst >= path; 178 src--, dst--, count++) 179 if (*src != *dst) 180 break; 181 182 /* 183 * At this point, 'count' is the number of characters 184 * matched from the end. 185 */ 186 if (count > matched || best == NULL) { 187 best = ne; 188 matched = count; 189 } 190 } 191 } 192 193 if (best == NULL) 194 return (0); 195 196 if (nvlist_add_string(nv, ZPOOL_CONFIG_PATH, best->ne_name) != 0) 197 return (-1); 198 199 if ((devid = get_devid(best->ne_name)) == NULL) { 200 (void) nvlist_remove_all(nv, ZPOOL_CONFIG_DEVID); 201 } else { 202 if (nvlist_add_string(nv, ZPOOL_CONFIG_DEVID, devid) != 0) { 203 devid_str_free(devid); 204 return (-1); 205 } 206 devid_str_free(devid); 207 } 208 209 return (0); 210} 211 212/* 213 * Add the given configuration to the list of known devices. 214 */ 215static int 216add_config(libzfs_handle_t *hdl, pool_list_t *pl, const char *path, 217 nvlist_t *config) 218{ 219 uint64_t pool_guid, vdev_guid, top_guid, txg, state; 220 pool_entry_t *pe; 221 vdev_entry_t *ve; 222 config_entry_t *ce; 223 name_entry_t *ne; 224 225 /* 226 * If this is a hot spare not currently in use or level 2 cache 227 * device, add it to the list of names to translate, but don't do 228 * anything else. 229 */ 230 if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_STATE, 231 &state) == 0 && 232 (state == POOL_STATE_SPARE || state == POOL_STATE_L2CACHE) && 233 nvlist_lookup_uint64(config, ZPOOL_CONFIG_GUID, &vdev_guid) == 0) { 234 if ((ne = zfs_alloc(hdl, sizeof (name_entry_t))) == NULL) 235 return (-1); 236 237 if ((ne->ne_name = zfs_strdup(hdl, path)) == NULL) { 238 free(ne); 239 return (-1); 240 } 241 ne->ne_guid = vdev_guid; 242 ne->ne_next = pl->names; 243 pl->names = ne; 244 return (0); 245 } 246 247 /* 248 * If we have a valid config but cannot read any of these fields, then 249 * it means we have a half-initialized label. In vdev_label_init() 250 * we write a label with txg == 0 so that we can identify the device 251 * in case the user refers to the same disk later on. If we fail to 252 * create the pool, we'll be left with a label in this state 253 * which should not be considered part of a valid pool. 254 */ 255 if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_GUID, 256 &pool_guid) != 0 || 257 nvlist_lookup_uint64(config, ZPOOL_CONFIG_GUID, 258 &vdev_guid) != 0 || 259 nvlist_lookup_uint64(config, ZPOOL_CONFIG_TOP_GUID, 260 &top_guid) != 0 || 261 nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_TXG, 262 &txg) != 0 || txg == 0) { 263 nvlist_free(config); 264 return (0); 265 } 266 267 /* 268 * First, see if we know about this pool. If not, then add it to the 269 * list of known pools. 270 */ 271 for (pe = pl->pools; pe != NULL; pe = pe->pe_next) { 272 if (pe->pe_guid == pool_guid) 273 break; 274 } 275 276 if (pe == NULL) { 277 if ((pe = zfs_alloc(hdl, sizeof (pool_entry_t))) == NULL) { 278 nvlist_free(config); 279 return (-1); 280 } 281 pe->pe_guid = pool_guid; 282 pe->pe_next = pl->pools; 283 pl->pools = pe; 284 } 285 286 /* 287 * Second, see if we know about this toplevel vdev. Add it if its 288 * missing. 289 */ 290 for (ve = pe->pe_vdevs; ve != NULL; ve = ve->ve_next) { 291 if (ve->ve_guid == top_guid) 292 break; 293 } 294 295 if (ve == NULL) { 296 if ((ve = zfs_alloc(hdl, sizeof (vdev_entry_t))) == NULL) { 297 nvlist_free(config); 298 return (-1); 299 } 300 ve->ve_guid = top_guid; 301 ve->ve_next = pe->pe_vdevs; 302 pe->pe_vdevs = ve; 303 } 304 305 /* 306 * Third, see if we have a config with a matching transaction group. If 307 * so, then we do nothing. Otherwise, add it to the list of known 308 * configs. 309 */ 310 for (ce = ve->ve_configs; ce != NULL; ce = ce->ce_next) { 311 if (ce->ce_txg == txg) 312 break; 313 } 314 315 if (ce == NULL) { 316 if ((ce = zfs_alloc(hdl, sizeof (config_entry_t))) == NULL) { 317 nvlist_free(config); 318 return (-1); 319 } 320 ce->ce_txg = txg; 321 ce->ce_config = config; 322 ce->ce_next = ve->ve_configs; 323 ve->ve_configs = ce; 324 } else { 325 nvlist_free(config); 326 } 327 328 /* 329 * At this point we've successfully added our config to the list of 330 * known configs. The last thing to do is add the vdev guid -> path 331 * mappings so that we can fix up the configuration as necessary before 332 * doing the import. 333 */ 334 if ((ne = zfs_alloc(hdl, sizeof (name_entry_t))) == NULL) 335 return (-1); 336 337 if ((ne->ne_name = zfs_strdup(hdl, path)) == NULL) { 338 free(ne); 339 return (-1); 340 } 341 342 ne->ne_guid = vdev_guid; 343 ne->ne_next = pl->names; 344 pl->names = ne; 345 346 return (0); 347} 348 349/* 350 * Returns true if the named pool matches the given GUID. 351 */ 352static int 353pool_active(libzfs_handle_t *hdl, const char *name, uint64_t guid, 354 boolean_t *isactive) 355{ 356 zpool_handle_t *zhp; 357 uint64_t theguid; 358 359 if (zpool_open_silent(hdl, name, &zhp) != 0) 360 return (-1); 361 362 if (zhp == NULL) { 363 *isactive = B_FALSE; 364 return (0); 365 } 366 367 verify(nvlist_lookup_uint64(zhp->zpool_config, ZPOOL_CONFIG_POOL_GUID, 368 &theguid) == 0); 369 370 zpool_close(zhp); 371 372 *isactive = (theguid == guid); 373 return (0); 374} 375 376static nvlist_t * 377refresh_config(libzfs_handle_t *hdl, nvlist_t *config) 378{ 379 nvlist_t *nvl; 380 zfs_cmd_t zc = { 0 }; 381 int err; 382 383 if (zcmd_write_conf_nvlist(hdl, &zc, config) != 0) 384 return (NULL); 385 386 if (zcmd_alloc_dst_nvlist(hdl, &zc, 387 zc.zc_nvlist_conf_size * 2) != 0) { 388 zcmd_free_nvlists(&zc); 389 return (NULL); 390 } 391 392 while ((err = ioctl(hdl->libzfs_fd, ZFS_IOC_POOL_TRYIMPORT, 393 &zc)) != 0 && errno == ENOMEM) { 394 if (zcmd_expand_dst_nvlist(hdl, &zc) != 0) { 395 zcmd_free_nvlists(&zc); 396 return (NULL); 397 } 398 } 399 400 if (err) { 401 zcmd_free_nvlists(&zc); 402 return (NULL); 403 } 404 405 if (zcmd_read_dst_nvlist(hdl, &zc, &nvl) != 0) { 406 zcmd_free_nvlists(&zc); 407 return (NULL); 408 } 409 410 zcmd_free_nvlists(&zc); 411 return (nvl); 412} 413 414/* 415 * Determine if the vdev id is a hole in the namespace. 416 */ 417boolean_t 418vdev_is_hole(uint64_t *hole_array, uint_t holes, uint_t id) 419{ 420 for (int c = 0; c < holes; c++) { 421 422 /* Top-level is a hole */ 423 if (hole_array[c] == id) 424 return (B_TRUE); 425 } 426 return (B_FALSE); 427} 428 429/* 430 * Convert our list of pools into the definitive set of configurations. We 431 * start by picking the best config for each toplevel vdev. Once that's done, 432 * we assemble the toplevel vdevs into a full config for the pool. We make a 433 * pass to fix up any incorrect paths, and then add it to the main list to 434 * return to the user. 435 */ 436static nvlist_t * 437get_configs(libzfs_handle_t *hdl, pool_list_t *pl, boolean_t active_ok) 438{ 439 pool_entry_t *pe; 440 vdev_entry_t *ve; 441 config_entry_t *ce; 442 nvlist_t *ret = NULL, *config = NULL, *tmp, *nvtop, *nvroot; 443 nvlist_t **spares, **l2cache; 444 uint_t i, nspares, nl2cache; 445 boolean_t config_seen; 446 uint64_t best_txg; 447 char *name, *hostname; 448 uint64_t guid; 449 uint_t children = 0; 450 nvlist_t **child = NULL; 451 uint_t holes; 452 uint64_t *hole_array, max_id; 453 uint_t c; 454 boolean_t isactive; 455 uint64_t hostid; 456 nvlist_t *nvl; 457 boolean_t found_one = B_FALSE; 458 boolean_t valid_top_config = B_FALSE; 459 460 if (nvlist_alloc(&ret, 0, 0) != 0) 461 goto nomem; 462 463 for (pe = pl->pools; pe != NULL; pe = pe->pe_next) { 464 uint64_t id, max_txg = 0; 465 466 if (nvlist_alloc(&config, NV_UNIQUE_NAME, 0) != 0) 467 goto nomem; 468 config_seen = B_FALSE; 469 470 /* 471 * Iterate over all toplevel vdevs. Grab the pool configuration 472 * from the first one we find, and then go through the rest and 473 * add them as necessary to the 'vdevs' member of the config. 474 */ 475 for (ve = pe->pe_vdevs; ve != NULL; ve = ve->ve_next) { 476 477 /* 478 * Determine the best configuration for this vdev by 479 * selecting the config with the latest transaction 480 * group. 481 */ 482 best_txg = 0; 483 for (ce = ve->ve_configs; ce != NULL; 484 ce = ce->ce_next) { 485 486 if (ce->ce_txg > best_txg) { 487 tmp = ce->ce_config; 488 best_txg = ce->ce_txg; 489 } 490 } 491 492 /* 493 * We rely on the fact that the max txg for the 494 * pool will contain the most up-to-date information 495 * about the valid top-levels in the vdev namespace. 496 */ 497 if (best_txg > max_txg) { 498 (void) nvlist_remove(config, 499 ZPOOL_CONFIG_VDEV_CHILDREN, 500 DATA_TYPE_UINT64); 501 (void) nvlist_remove(config, 502 ZPOOL_CONFIG_HOLE_ARRAY, 503 DATA_TYPE_UINT64_ARRAY); 504 505 max_txg = best_txg; 506 hole_array = NULL; 507 holes = 0; 508 max_id = 0; 509 valid_top_config = B_FALSE; 510 511 if (nvlist_lookup_uint64(tmp, 512 ZPOOL_CONFIG_VDEV_CHILDREN, &max_id) == 0) { 513 verify(nvlist_add_uint64(config, 514 ZPOOL_CONFIG_VDEV_CHILDREN, 515 max_id) == 0); 516 valid_top_config = B_TRUE; 517 } 518 519 if (nvlist_lookup_uint64_array(tmp, 520 ZPOOL_CONFIG_HOLE_ARRAY, &hole_array, 521 &holes) == 0) { 522 verify(nvlist_add_uint64_array(config, 523 ZPOOL_CONFIG_HOLE_ARRAY, 524 hole_array, holes) == 0); 525 } 526 } 527 528 if (!config_seen) { 529 /* 530 * Copy the relevant pieces of data to the pool 531 * configuration: 532 * 533 * version 534 * pool guid 535 * name 536 * comment (if available) 537 * pool state 538 * hostid (if available) 539 * hostname (if available) 540 */ 541 uint64_t state, version; 542 char *comment = NULL; 543 544 version = fnvlist_lookup_uint64(tmp, 545 ZPOOL_CONFIG_VERSION); 546 fnvlist_add_uint64(config, 547 ZPOOL_CONFIG_VERSION, version); 548 guid = fnvlist_lookup_uint64(tmp, 549 ZPOOL_CONFIG_POOL_GUID); 550 fnvlist_add_uint64(config, 551 ZPOOL_CONFIG_POOL_GUID, guid); 552 name = fnvlist_lookup_string(tmp, 553 ZPOOL_CONFIG_POOL_NAME); 554 fnvlist_add_string(config, 555 ZPOOL_CONFIG_POOL_NAME, name); 556 557 if (nvlist_lookup_string(tmp, 558 ZPOOL_CONFIG_COMMENT, &comment) == 0) 559 fnvlist_add_string(config, 560 ZPOOL_CONFIG_COMMENT, comment); 561 562 state = fnvlist_lookup_uint64(tmp, 563 ZPOOL_CONFIG_POOL_STATE); 564 fnvlist_add_uint64(config, 565 ZPOOL_CONFIG_POOL_STATE, state); 566 567 hostid = 0; 568 if (nvlist_lookup_uint64(tmp, 569 ZPOOL_CONFIG_HOSTID, &hostid) == 0) { 570 fnvlist_add_uint64(config, 571 ZPOOL_CONFIG_HOSTID, hostid); 572 hostname = fnvlist_lookup_string(tmp, 573 ZPOOL_CONFIG_HOSTNAME); 574 fnvlist_add_string(config, 575 ZPOOL_CONFIG_HOSTNAME, hostname); 576 } 577 578 config_seen = B_TRUE; 579 } 580 581 /* 582 * Add this top-level vdev to the child array. 583 */ 584 verify(nvlist_lookup_nvlist(tmp, 585 ZPOOL_CONFIG_VDEV_TREE, &nvtop) == 0); 586 verify(nvlist_lookup_uint64(nvtop, ZPOOL_CONFIG_ID, 587 &id) == 0); 588 589 if (id >= children) { 590 nvlist_t **newchild; 591 592 newchild = zfs_alloc(hdl, (id + 1) * 593 sizeof (nvlist_t *)); 594 if (newchild == NULL) 595 goto nomem; 596 597 for (c = 0; c < children; c++) 598 newchild[c] = child[c]; 599 600 free(child); 601 child = newchild; 602 children = id + 1; 603 } 604 if (nvlist_dup(nvtop, &child[id], 0) != 0) 605 goto nomem; 606 607 } 608 609 /* 610 * If we have information about all the top-levels then 611 * clean up the nvlist which we've constructed. This 612 * means removing any extraneous devices that are 613 * beyond the valid range or adding devices to the end 614 * of our array which appear to be missing. 615 */ 616 if (valid_top_config) { 617 if (max_id < children) { 618 for (c = max_id; c < children; c++) 619 nvlist_free(child[c]); 620 children = max_id; 621 } else if (max_id > children) { 622 nvlist_t **newchild; 623 624 newchild = zfs_alloc(hdl, (max_id) * 625 sizeof (nvlist_t *)); 626 if (newchild == NULL) 627 goto nomem; 628 629 for (c = 0; c < children; c++) 630 newchild[c] = child[c]; 631 632 free(child); 633 child = newchild; 634 children = max_id; 635 } 636 } 637 638 verify(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_GUID, 639 &guid) == 0); 640 641 /* 642 * The vdev namespace may contain holes as a result of 643 * device removal. We must add them back into the vdev 644 * tree before we process any missing devices. 645 */ 646 if (holes > 0) { 647 ASSERT(valid_top_config); 648 649 for (c = 0; c < children; c++) { 650 nvlist_t *holey; 651 652 if (child[c] != NULL || 653 !vdev_is_hole(hole_array, holes, c)) 654 continue; 655 656 if (nvlist_alloc(&holey, NV_UNIQUE_NAME, 657 0) != 0) 658 goto nomem; 659 660 /* 661 * Holes in the namespace are treated as 662 * "hole" top-level vdevs and have a 663 * special flag set on them. 664 */ 665 if (nvlist_add_string(holey, 666 ZPOOL_CONFIG_TYPE, 667 VDEV_TYPE_HOLE) != 0 || 668 nvlist_add_uint64(holey, 669 ZPOOL_CONFIG_ID, c) != 0 || 670 nvlist_add_uint64(holey, 671 ZPOOL_CONFIG_GUID, 0ULL) != 0) { 672 nvlist_free(holey); 673 goto nomem; 674 } 675 child[c] = holey; 676 } 677 } 678 679 /* 680 * Look for any missing top-level vdevs. If this is the case, 681 * create a faked up 'missing' vdev as a placeholder. We cannot 682 * simply compress the child array, because the kernel performs 683 * certain checks to make sure the vdev IDs match their location 684 * in the configuration. 685 */ 686 for (c = 0; c < children; c++) { 687 if (child[c] == NULL) { 688 nvlist_t *missing; 689 if (nvlist_alloc(&missing, NV_UNIQUE_NAME, 690 0) != 0) 691 goto nomem; 692 if (nvlist_add_string(missing, 693 ZPOOL_CONFIG_TYPE, 694 VDEV_TYPE_MISSING) != 0 || 695 nvlist_add_uint64(missing, 696 ZPOOL_CONFIG_ID, c) != 0 || 697 nvlist_add_uint64(missing, 698 ZPOOL_CONFIG_GUID, 0ULL) != 0) { 699 nvlist_free(missing); 700 goto nomem; 701 } 702 child[c] = missing; 703 } 704 } 705 706 /* 707 * Put all of this pool's top-level vdevs into a root vdev. 708 */ 709 if (nvlist_alloc(&nvroot, NV_UNIQUE_NAME, 0) != 0) 710 goto nomem; 711 if (nvlist_add_string(nvroot, ZPOOL_CONFIG_TYPE, 712 VDEV_TYPE_ROOT) != 0 || 713 nvlist_add_uint64(nvroot, ZPOOL_CONFIG_ID, 0ULL) != 0 || 714 nvlist_add_uint64(nvroot, ZPOOL_CONFIG_GUID, guid) != 0 || 715 nvlist_add_nvlist_array(nvroot, ZPOOL_CONFIG_CHILDREN, 716 child, children) != 0) { 717 nvlist_free(nvroot); 718 goto nomem; 719 } 720 721 for (c = 0; c < children; c++) 722 nvlist_free(child[c]); 723 free(child); 724 children = 0; 725 child = NULL; 726 727 /* 728 * Go through and fix up any paths and/or devids based on our 729 * known list of vdev GUID -> path mappings. 730 */ 731 if (fix_paths(nvroot, pl->names) != 0) { 732 nvlist_free(nvroot); 733 goto nomem; 734 } 735 736 /* 737 * Add the root vdev to this pool's configuration. 738 */ 739 if (nvlist_add_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, 740 nvroot) != 0) { 741 nvlist_free(nvroot); 742 goto nomem; 743 } 744 nvlist_free(nvroot); 745 746 /* 747 * zdb uses this path to report on active pools that were 748 * imported or created using -R. 749 */ 750 if (active_ok) 751 goto add_pool; 752 753 /* 754 * Determine if this pool is currently active, in which case we 755 * can't actually import it. 756 */ 757 verify(nvlist_lookup_string(config, ZPOOL_CONFIG_POOL_NAME, 758 &name) == 0); 759 verify(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_GUID, 760 &guid) == 0); 761 762 if (pool_active(hdl, name, guid, &isactive) != 0) 763 goto error; 764 765 if (isactive) { 766 nvlist_free(config); 767 config = NULL; 768 continue; 769 } 770 771 if ((nvl = refresh_config(hdl, config)) == NULL) { 772 nvlist_free(config); 773 config = NULL; 774 continue; 775 } 776 777 nvlist_free(config); 778 config = nvl; 779 780 /* 781 * Go through and update the paths for spares, now that we have 782 * them. 783 */ 784 verify(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, 785 &nvroot) == 0); 786 if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_SPARES, 787 &spares, &nspares) == 0) { 788 for (i = 0; i < nspares; i++) { 789 if (fix_paths(spares[i], pl->names) != 0) 790 goto nomem; 791 } 792 } 793 794 /* 795 * Update the paths for l2cache devices. 796 */ 797 if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_L2CACHE, 798 &l2cache, &nl2cache) == 0) { 799 for (i = 0; i < nl2cache; i++) { 800 if (fix_paths(l2cache[i], pl->names) != 0) 801 goto nomem; 802 } 803 } 804 805 /* 806 * Restore the original information read from the actual label. 807 */ 808 (void) nvlist_remove(config, ZPOOL_CONFIG_HOSTID, 809 DATA_TYPE_UINT64); 810 (void) nvlist_remove(config, ZPOOL_CONFIG_HOSTNAME, 811 DATA_TYPE_STRING); 812 if (hostid != 0) { 813 verify(nvlist_add_uint64(config, ZPOOL_CONFIG_HOSTID, 814 hostid) == 0); 815 verify(nvlist_add_string(config, ZPOOL_CONFIG_HOSTNAME, 816 hostname) == 0); 817 } 818 819add_pool: 820 /* 821 * Add this pool to the list of configs. 822 */ 823 verify(nvlist_lookup_string(config, ZPOOL_CONFIG_POOL_NAME, 824 &name) == 0); 825 if (nvlist_add_nvlist(ret, name, config) != 0) 826 goto nomem; 827 828 found_one = B_TRUE; 829 nvlist_free(config); 830 config = NULL; 831 } 832 833 if (!found_one) { 834 nvlist_free(ret); 835 ret = NULL; 836 } 837 838 return (ret); 839 840nomem: 841 (void) no_memory(hdl); 842error: 843 nvlist_free(config); 844 nvlist_free(ret); 845 for (c = 0; c < children; c++) 846 nvlist_free(child[c]); 847 free(child); 848 849 return (NULL); 850} 851 852/* 853 * Return the offset of the given label. 854 */ 855static uint64_t 856label_offset(uint64_t size, int l) 857{ 858 ASSERT(P2PHASE_TYPED(size, sizeof (vdev_label_t), uint64_t) == 0); 859 return (l * sizeof (vdev_label_t) + (l < VDEV_LABELS / 2 ? 860 0 : size - VDEV_LABELS * sizeof (vdev_label_t))); 861} 862 863/* 864 * Given a file descriptor, read the label information and return an nvlist 865 * describing the configuration, if there is one. 866 */ 867int 868zpool_read_label(int fd, nvlist_t **config) 869{ 870 struct stat64 statbuf; 871 int l; 872 vdev_label_t *label; 873 uint64_t state, txg, size; 874 875 *config = NULL; 876 877 if (fstat64(fd, &statbuf) == -1) 878 return (0); 879 size = P2ALIGN_TYPED(statbuf.st_size, sizeof (vdev_label_t), uint64_t); 880 881 if ((label = malloc(sizeof (vdev_label_t))) == NULL) 882 return (-1); 883 884 for (l = 0; l < VDEV_LABELS; l++) { 885 if (pread64(fd, label, sizeof (vdev_label_t), 886 label_offset(size, l)) != sizeof (vdev_label_t)) 887 continue; 888 889 if (nvlist_unpack(label->vl_vdev_phys.vp_nvlist, 890 sizeof (label->vl_vdev_phys.vp_nvlist), config, 0) != 0) 891 continue; 892 893 if (nvlist_lookup_uint64(*config, ZPOOL_CONFIG_POOL_STATE, 894 &state) != 0 || state > POOL_STATE_L2CACHE) { 895 nvlist_free(*config); 896 continue; 897 } 898 899 if (state != POOL_STATE_SPARE && state != POOL_STATE_L2CACHE && 900 (nvlist_lookup_uint64(*config, ZPOOL_CONFIG_POOL_TXG, 901 &txg) != 0 || txg == 0)) { 902 nvlist_free(*config); 903 continue; 904 } 905 906 free(label); 907 return (0); 908 } 909 910 free(label); 911 *config = NULL; 912 return (0); 913} 914 915typedef struct rdsk_node { 916 char *rn_name; 917 int rn_dfd; 918 libzfs_handle_t *rn_hdl; 919 nvlist_t *rn_config; 920 avl_tree_t *rn_avl; 921 avl_node_t rn_node; 922 boolean_t rn_nozpool; 923} rdsk_node_t; 924 925static int 926slice_cache_compare(const void *arg1, const void *arg2) 927{ 928 const char *nm1 = ((rdsk_node_t *)arg1)->rn_name; 929 const char *nm2 = ((rdsk_node_t *)arg2)->rn_name; 930 char *nm1slice, *nm2slice; 931 int rv; 932 933 /* 934 * slices zero and two are the most likely to provide results, 935 * so put those first 936 */ 937 nm1slice = strstr(nm1, "s0"); 938 nm2slice = strstr(nm2, "s0"); 939 if (nm1slice && !nm2slice) { 940 return (-1); 941 } 942 if (!nm1slice && nm2slice) { 943 return (1); 944 } 945 nm1slice = strstr(nm1, "s2"); 946 nm2slice = strstr(nm2, "s2"); 947 if (nm1slice && !nm2slice) { 948 return (-1); 949 } 950 if (!nm1slice && nm2slice) { 951 return (1); 952 } 953 954 rv = strcmp(nm1, nm2); 955 if (rv == 0) 956 return (0); 957 return (rv > 0 ? 1 : -1); 958} 959 960#ifdef sun 961static void 962check_one_slice(avl_tree_t *r, char *diskname, uint_t partno, 963 diskaddr_t size, uint_t blksz) 964{ 965 rdsk_node_t tmpnode; 966 rdsk_node_t *node; 967 char sname[MAXNAMELEN]; 968 969 tmpnode.rn_name = &sname[0]; 970 (void) snprintf(tmpnode.rn_name, MAXNAMELEN, "%s%u", 971 diskname, partno); 972 /* 973 * protect against division by zero for disk labels that 974 * contain a bogus sector size 975 */ 976 if (blksz == 0) 977 blksz = DEV_BSIZE; 978 /* too small to contain a zpool? */ 979 if ((size < (SPA_MINDEVSIZE / blksz)) && 980 (node = avl_find(r, &tmpnode, NULL))) 981 node->rn_nozpool = B_TRUE; 982} 983#endif /* sun */ 984 985static void 986nozpool_all_slices(avl_tree_t *r, const char *sname) 987{ 988#ifdef sun 989 char diskname[MAXNAMELEN]; 990 char *ptr; 991 int i; 992 993 (void) strncpy(diskname, sname, MAXNAMELEN); 994 if (((ptr = strrchr(diskname, 's')) == NULL) && 995 ((ptr = strrchr(diskname, 'p')) == NULL)) 996 return; 997 ptr[0] = 's'; 998 ptr[1] = '\0'; 999 for (i = 0; i < NDKMAP; i++) 1000 check_one_slice(r, diskname, i, 0, 1); 1001 ptr[0] = 'p'; 1002 for (i = 0; i <= FD_NUMPART; i++) 1003 check_one_slice(r, diskname, i, 0, 1); 1004#endif /* sun */ 1005} 1006 1007#ifdef sun 1008static void 1009check_slices(avl_tree_t *r, int fd, const char *sname) 1010{ 1011 struct extvtoc vtoc; 1012 struct dk_gpt *gpt; 1013 char diskname[MAXNAMELEN]; 1014 char *ptr; 1015 int i; 1016 1017 (void) strncpy(diskname, sname, MAXNAMELEN); 1018 if ((ptr = strrchr(diskname, 's')) == NULL || !isdigit(ptr[1])) 1019 return; 1020 ptr[1] = '\0'; 1021 1022 if (read_extvtoc(fd, &vtoc) >= 0) { 1023 for (i = 0; i < NDKMAP; i++) 1024 check_one_slice(r, diskname, i, 1025 vtoc.v_part[i].p_size, vtoc.v_sectorsz); 1026 } else if (efi_alloc_and_read(fd, &gpt) >= 0) { 1027 /* 1028 * on x86 we'll still have leftover links that point 1029 * to slices s[9-15], so use NDKMAP instead 1030 */ 1031 for (i = 0; i < NDKMAP; i++) 1032 check_one_slice(r, diskname, i, 1033 gpt->efi_parts[i].p_size, gpt->efi_lbasize); 1034 /* nodes p[1-4] are never used with EFI labels */ 1035 ptr[0] = 'p'; 1036 for (i = 1; i <= FD_NUMPART; i++) 1037 check_one_slice(r, diskname, i, 0, 1); 1038 efi_free(gpt); 1039 } 1040} 1041#endif /* sun */ 1042 1043static void 1044zpool_open_func(void *arg) 1045{ 1046 rdsk_node_t *rn = arg; 1047 struct stat64 statbuf; 1048 nvlist_t *config; 1049 int fd; 1050 1051 if (rn->rn_nozpool) 1052 return; 1053 if ((fd = openat64(rn->rn_dfd, rn->rn_name, O_RDONLY)) < 0) { 1054 /* symlink to a device that's no longer there */ 1055 if (errno == ENOENT) 1056 nozpool_all_slices(rn->rn_avl, rn->rn_name); 1057 return; 1058 } 1059 /* 1060 * Ignore failed stats. We only want regular 1061 * files, character devs and block devs. 1062 */ 1063 if (fstat64(fd, &statbuf) != 0 || 1064 (!S_ISREG(statbuf.st_mode) && 1065 !S_ISCHR(statbuf.st_mode) && 1066 !S_ISBLK(statbuf.st_mode))) { 1067 (void) close(fd); 1068 return; 1069 } 1070 /* this file is too small to hold a zpool */ 1071#ifdef sun 1072 if (S_ISREG(statbuf.st_mode) && 1073 statbuf.st_size < SPA_MINDEVSIZE) { 1074 (void) close(fd); 1075 return; 1076 } else if (!S_ISREG(statbuf.st_mode)) { 1077 /* 1078 * Try to read the disk label first so we don't have to 1079 * open a bunch of minor nodes that can't have a zpool. 1080 */ 1081 check_slices(rn->rn_avl, fd, rn->rn_name); 1082 } 1083#else /* !sun */ 1084 if (statbuf.st_size < SPA_MINDEVSIZE) { 1085 (void) close(fd); 1086 return; 1087 } 1088#endif /* sun */ 1089 1090 if ((zpool_read_label(fd, &config)) != 0) { 1091 (void) close(fd); 1092 (void) no_memory(rn->rn_hdl); 1093 return; 1094 } 1095 (void) close(fd); 1096 1097 1098 rn->rn_config = config; 1099 if (config != NULL) { 1100 assert(rn->rn_nozpool == B_FALSE); 1101 } 1102} 1103 1104/* 1105 * Given a file descriptor, clear (zero) the label information. This function 1106 * is used in the appliance stack as part of the ZFS sysevent module and 1107 * to implement the "zpool labelclear" command. 1108 */ 1109int 1110zpool_clear_label(int fd) 1111{ 1112 struct stat64 statbuf; 1113 int l; 1114 vdev_label_t *label; 1115 uint64_t size; 1116 1117 if (fstat64(fd, &statbuf) == -1) 1118 return (0); 1119 size = P2ALIGN_TYPED(statbuf.st_size, sizeof (vdev_label_t), uint64_t); 1120 1121 if ((label = calloc(sizeof (vdev_label_t), 1)) == NULL) 1122 return (-1); 1123 1124 for (l = 0; l < VDEV_LABELS; l++) { 1125 if (pwrite64(fd, label, sizeof (vdev_label_t), 1126 label_offset(size, l)) != sizeof (vdev_label_t)) { 1127 free(label); 1128 return (-1); 1129 } 1130 } 1131 1132 free(label); 1133 return (0); 1134} 1135 1136/* 1137 * Given a list of directories to search, find all pools stored on disk. This 1138 * includes partial pools which are not available to import. If no args are 1139 * given (argc is 0), then the default directory (/dev/dsk) is searched. 1140 * poolname or guid (but not both) are provided by the caller when trying 1141 * to import a specific pool. 1142 */ 1143static nvlist_t * 1144zpool_find_import_impl(libzfs_handle_t *hdl, importargs_t *iarg) 1145{ 1146 int i, dirs = iarg->paths; 1147 struct dirent64 *dp; 1148 char path[MAXPATHLEN]; 1149 char *end, **dir = iarg->path; 1150 size_t pathleft; 1151 nvlist_t *ret = NULL; 1152 static char *default_dir = "/dev"; 1153 pool_list_t pools = { 0 }; 1154 pool_entry_t *pe, *penext; 1155 vdev_entry_t *ve, *venext; 1156 config_entry_t *ce, *cenext; 1157 name_entry_t *ne, *nenext; 1158 avl_tree_t slice_cache; 1159 rdsk_node_t *slice; 1160 void *cookie; 1161 1162 if (dirs == 0) { 1163 dirs = 1; 1164 dir = &default_dir; 1165 } 1166 1167 /* 1168 * Go through and read the label configuration information from every 1169 * possible device, organizing the information according to pool GUID 1170 * and toplevel GUID. 1171 */ 1172 for (i = 0; i < dirs; i++) { 1173 tpool_t *t; 1174 char *rdsk; 1175 int dfd; 1176 boolean_t config_failed = B_FALSE; 1177 DIR *dirp; 1178 1179 /* use realpath to normalize the path */ 1180 if (realpath(dir[i], path) == 0) { 1181 (void) zfs_error_fmt(hdl, EZFS_BADPATH, 1182 dgettext(TEXT_DOMAIN, "cannot open '%s'"), dir[i]); 1183 goto error; 1184 } 1185 end = &path[strlen(path)]; 1186 *end++ = '/'; 1187 *end = 0; 1188 pathleft = &path[sizeof (path)] - end; 1189 1190 /* 1191 * Using raw devices instead of block devices when we're 1192 * reading the labels skips a bunch of slow operations during 1193 * close(2) processing, so we replace /dev/dsk with /dev/rdsk. 1194 */ 1195 if (strcmp(path, "/dev/dsk/") == 0) 1196 rdsk = "/dev/"; 1197 else 1198 rdsk = path; 1199 1200 if ((dfd = open64(rdsk, O_RDONLY)) < 0 || 1201 (dirp = fdopendir(dfd)) == NULL) { 1202 if (dfd >= 0) 1203 (void) close(dfd); 1204 zfs_error_aux(hdl, strerror(errno)); 1205 (void) zfs_error_fmt(hdl, EZFS_BADPATH, 1206 dgettext(TEXT_DOMAIN, "cannot open '%s'"), 1207 rdsk); 1208 goto error; 1209 } 1210 1211 avl_create(&slice_cache, slice_cache_compare, 1212 sizeof (rdsk_node_t), offsetof(rdsk_node_t, rn_node)); 1213 1214 if (strcmp(rdsk, "/dev/") == 0) { 1215 struct gmesh mesh; 1216 struct gclass *mp; 1217 struct ggeom *gp; 1218 struct gprovider *pp; 1219 1220 errno = geom_gettree(&mesh); 1221 if (errno != 0) { 1222 zfs_error_aux(hdl, strerror(errno)); 1223 (void) zfs_error_fmt(hdl, EZFS_BADPATH, 1224 dgettext(TEXT_DOMAIN, "cannot get GEOM tree")); 1225 goto error; 1226 } 1227 1228 LIST_FOREACH(mp, &mesh.lg_class, lg_class) { 1229 LIST_FOREACH(gp, &mp->lg_geom, lg_geom) { 1230 LIST_FOREACH(pp, &gp->lg_provider, lg_provider) { 1231 slice = zfs_alloc(hdl, sizeof (rdsk_node_t)); 1232 slice->rn_name = zfs_strdup(hdl, pp->lg_name); 1233 slice->rn_avl = &slice_cache; 1234 slice->rn_dfd = dfd; 1235 slice->rn_hdl = hdl; 1236 slice->rn_nozpool = B_FALSE; 1237 avl_add(&slice_cache, slice); 1238 } 1239 } 1240 } 1241 1242 geom_deletetree(&mesh); 1243 goto skipdir; 1244 } 1245 1246 /* 1247 * This is not MT-safe, but we have no MT consumers of libzfs 1248 */ 1249 while ((dp = readdir64(dirp)) != NULL) { 1250 const char *name = dp->d_name; 1251 if (name[0] == '.' && 1252 (name[1] == 0 || (name[1] == '.' && name[2] == 0))) 1253 continue; 1254 1255 slice = zfs_alloc(hdl, sizeof (rdsk_node_t)); 1256 slice->rn_name = zfs_strdup(hdl, name); 1257 slice->rn_avl = &slice_cache; 1258 slice->rn_dfd = dfd; 1259 slice->rn_hdl = hdl; 1260 slice->rn_nozpool = B_FALSE; 1261 avl_add(&slice_cache, slice); 1262 } 1263skipdir: 1264 /* 1265 * create a thread pool to do all of this in parallel; 1266 * rn_nozpool is not protected, so this is racy in that 1267 * multiple tasks could decide that the same slice can 1268 * not hold a zpool, which is benign. Also choose 1269 * double the number of processors; we hold a lot of 1270 * locks in the kernel, so going beyond this doesn't 1271 * buy us much. 1272 */ 1273 t = tpool_create(1, 2 * sysconf(_SC_NPROCESSORS_ONLN), 1274 0, NULL); 1275 for (slice = avl_first(&slice_cache); slice; 1276 (slice = avl_walk(&slice_cache, slice, 1277 AVL_AFTER))) 1278 (void) tpool_dispatch(t, zpool_open_func, slice); 1279 tpool_wait(t); 1280 tpool_destroy(t); 1281 1282 cookie = NULL; 1283 while ((slice = avl_destroy_nodes(&slice_cache, 1284 &cookie)) != NULL) { 1285 if (slice->rn_config != NULL && !config_failed) { 1286 nvlist_t *config = slice->rn_config; 1287 boolean_t matched = B_TRUE; 1288 1289 if (iarg->poolname != NULL) { 1290 char *pname; 1291 1292 matched = nvlist_lookup_string(config, 1293 ZPOOL_CONFIG_POOL_NAME, 1294 &pname) == 0 && 1295 strcmp(iarg->poolname, pname) == 0; 1296 } else if (iarg->guid != 0) { 1297 uint64_t this_guid; 1298 1299 matched = nvlist_lookup_uint64(config, 1300 ZPOOL_CONFIG_POOL_GUID, 1301 &this_guid) == 0 && 1302 iarg->guid == this_guid; 1303 } 1304 if (!matched) { 1305 nvlist_free(config); 1306 } else { 1307 /* 1308 * use the non-raw path for the config 1309 */ 1310 (void) strlcpy(end, slice->rn_name, 1311 pathleft); 1312 if (add_config(hdl, &pools, path, 1313 config) != 0) 1314 config_failed = B_TRUE; 1315 } 1316 } 1317 free(slice->rn_name); 1318 free(slice); 1319 } 1320 avl_destroy(&slice_cache); 1321 1322 (void) closedir(dirp); 1323 1324 if (config_failed) 1325 goto error; 1326 } 1327 1328 ret = get_configs(hdl, &pools, iarg->can_be_active); 1329 1330error: 1331 for (pe = pools.pools; pe != NULL; pe = penext) { 1332 penext = pe->pe_next; 1333 for (ve = pe->pe_vdevs; ve != NULL; ve = venext) { 1334 venext = ve->ve_next; 1335 for (ce = ve->ve_configs; ce != NULL; ce = cenext) { 1336 cenext = ce->ce_next; 1337 if (ce->ce_config) 1338 nvlist_free(ce->ce_config); 1339 free(ce); 1340 } 1341 free(ve); 1342 } 1343 free(pe); 1344 } 1345 1346 for (ne = pools.names; ne != NULL; ne = nenext) { 1347 nenext = ne->ne_next; 1348 free(ne->ne_name); 1349 free(ne); 1350 } 1351 1352 return (ret); 1353} 1354 1355nvlist_t * 1356zpool_find_import(libzfs_handle_t *hdl, int argc, char **argv) 1357{ 1358 importargs_t iarg = { 0 }; 1359 1360 iarg.paths = argc; 1361 iarg.path = argv; 1362 1363 return (zpool_find_import_impl(hdl, &iarg)); 1364} 1365 1366/* 1367 * Given a cache file, return the contents as a list of importable pools. 1368 * poolname or guid (but not both) are provided by the caller when trying 1369 * to import a specific pool. 1370 */ 1371nvlist_t * 1372zpool_find_import_cached(libzfs_handle_t *hdl, const char *cachefile, 1373 char *poolname, uint64_t guid) 1374{ 1375 char *buf; 1376 int fd; 1377 struct stat64 statbuf; 1378 nvlist_t *raw, *src, *dst; 1379 nvlist_t *pools; 1380 nvpair_t *elem; 1381 char *name; 1382 uint64_t this_guid; 1383 boolean_t active; 1384 1385 verify(poolname == NULL || guid == 0); 1386 1387 if ((fd = open(cachefile, O_RDONLY)) < 0) { 1388 zfs_error_aux(hdl, "%s", strerror(errno)); 1389 (void) zfs_error(hdl, EZFS_BADCACHE, 1390 dgettext(TEXT_DOMAIN, "failed to open cache file")); 1391 return (NULL); 1392 } 1393 1394 if (fstat64(fd, &statbuf) != 0) { 1395 zfs_error_aux(hdl, "%s", strerror(errno)); 1396 (void) close(fd); 1397 (void) zfs_error(hdl, EZFS_BADCACHE, 1398 dgettext(TEXT_DOMAIN, "failed to get size of cache file")); 1399 return (NULL); 1400 } 1401 1402 if ((buf = zfs_alloc(hdl, statbuf.st_size)) == NULL) { 1403 (void) close(fd); 1404 return (NULL); 1405 } 1406 1407 if (read(fd, buf, statbuf.st_size) != statbuf.st_size) { 1408 (void) close(fd); 1409 free(buf); 1410 (void) zfs_error(hdl, EZFS_BADCACHE, 1411 dgettext(TEXT_DOMAIN, 1412 "failed to read cache file contents")); 1413 return (NULL); 1414 } 1415 1416 (void) close(fd); 1417 1418 if (nvlist_unpack(buf, statbuf.st_size, &raw, 0) != 0) { 1419 free(buf); 1420 (void) zfs_error(hdl, EZFS_BADCACHE, 1421 dgettext(TEXT_DOMAIN, 1422 "invalid or corrupt cache file contents")); 1423 return (NULL); 1424 } 1425 1426 free(buf); 1427 1428 /* 1429 * Go through and get the current state of the pools and refresh their 1430 * state. 1431 */ 1432 if (nvlist_alloc(&pools, 0, 0) != 0) { 1433 (void) no_memory(hdl); 1434 nvlist_free(raw); 1435 return (NULL); 1436 } 1437 1438 elem = NULL; 1439 while ((elem = nvlist_next_nvpair(raw, elem)) != NULL) { 1440 src = fnvpair_value_nvlist(elem); 1441 1442 name = fnvlist_lookup_string(src, ZPOOL_CONFIG_POOL_NAME); 1443 if (poolname != NULL && strcmp(poolname, name) != 0) 1444 continue; 1445 1446 this_guid = fnvlist_lookup_uint64(src, ZPOOL_CONFIG_POOL_GUID); 1447 if (guid != 0 && guid != this_guid) 1448 continue; 1449 1450 if (pool_active(hdl, name, this_guid, &active) != 0) { 1451 nvlist_free(raw); 1452 nvlist_free(pools); 1453 return (NULL); 1454 } 1455 1456 if (active) 1457 continue; 1458 1459 if ((dst = refresh_config(hdl, src)) == NULL) { 1460 nvlist_free(raw); 1461 nvlist_free(pools); 1462 return (NULL); 1463 } 1464 1465 if (nvlist_add_nvlist(pools, nvpair_name(elem), dst) != 0) { 1466 (void) no_memory(hdl); 1467 nvlist_free(dst); 1468 nvlist_free(raw); 1469 nvlist_free(pools); 1470 return (NULL); 1471 } 1472 nvlist_free(dst); 1473 } 1474 1475 nvlist_free(raw); 1476 return (pools); 1477} 1478 1479static int 1480name_or_guid_exists(zpool_handle_t *zhp, void *data) 1481{ 1482 importargs_t *import = data; 1483 int found = 0; 1484 1485 if (import->poolname != NULL) { 1486 char *pool_name; 1487 1488 verify(nvlist_lookup_string(zhp->zpool_config, 1489 ZPOOL_CONFIG_POOL_NAME, &pool_name) == 0); 1490 if (strcmp(pool_name, import->poolname) == 0) 1491 found = 1; 1492 } else { 1493 uint64_t pool_guid; 1494 1495 verify(nvlist_lookup_uint64(zhp->zpool_config, 1496 ZPOOL_CONFIG_POOL_GUID, &pool_guid) == 0); 1497 if (pool_guid == import->guid) 1498 found = 1; 1499 } 1500 1501 zpool_close(zhp); 1502 return (found); 1503} 1504 1505nvlist_t * 1506zpool_search_import(libzfs_handle_t *hdl, importargs_t *import) 1507{ 1508 verify(import->poolname == NULL || import->guid == 0); 1509 1510 if (import->unique) 1511 import->exists = zpool_iter(hdl, name_or_guid_exists, import); 1512 1513 if (import->cachefile != NULL) 1514 return (zpool_find_import_cached(hdl, import->cachefile, 1515 import->poolname, import->guid)); 1516 1517 return (zpool_find_import_impl(hdl, import)); 1518} 1519 1520boolean_t 1521find_guid(nvlist_t *nv, uint64_t guid) 1522{ 1523 uint64_t tmp; 1524 nvlist_t **child; 1525 uint_t c, children; 1526 1527 verify(nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &tmp) == 0); 1528 if (tmp == guid) 1529 return (B_TRUE); 1530 1531 if (nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_CHILDREN, 1532 &child, &children) == 0) { 1533 for (c = 0; c < children; c++) 1534 if (find_guid(child[c], guid)) 1535 return (B_TRUE); 1536 } 1537 1538 return (B_FALSE); 1539} 1540 1541typedef struct aux_cbdata { 1542 const char *cb_type; 1543 uint64_t cb_guid; 1544 zpool_handle_t *cb_zhp; 1545} aux_cbdata_t; 1546 1547static int 1548find_aux(zpool_handle_t *zhp, void *data) 1549{ 1550 aux_cbdata_t *cbp = data; 1551 nvlist_t **list; 1552 uint_t i, count; 1553 uint64_t guid; 1554 nvlist_t *nvroot; 1555 1556 verify(nvlist_lookup_nvlist(zhp->zpool_config, ZPOOL_CONFIG_VDEV_TREE, 1557 &nvroot) == 0); 1558 1559 if (nvlist_lookup_nvlist_array(nvroot, cbp->cb_type, 1560 &list, &count) == 0) { 1561 for (i = 0; i < count; i++) { 1562 verify(nvlist_lookup_uint64(list[i], 1563 ZPOOL_CONFIG_GUID, &guid) == 0); 1564 if (guid == cbp->cb_guid) { 1565 cbp->cb_zhp = zhp; 1566 return (1); 1567 } 1568 } 1569 } 1570 1571 zpool_close(zhp); 1572 return (0); 1573} 1574 1575/* 1576 * Determines if the pool is in use. If so, it returns true and the state of 1577 * the pool as well as the name of the pool. Both strings are allocated and 1578 * must be freed by the caller. 1579 */ 1580int 1581zpool_in_use(libzfs_handle_t *hdl, int fd, pool_state_t *state, char **namestr, 1582 boolean_t *inuse) 1583{ 1584 nvlist_t *config; 1585 char *name; 1586 boolean_t ret; 1587 uint64_t guid, vdev_guid; 1588 zpool_handle_t *zhp; 1589 nvlist_t *pool_config; 1590 uint64_t stateval, isspare; 1591 aux_cbdata_t cb = { 0 }; 1592 boolean_t isactive; 1593 1594 *inuse = B_FALSE; 1595 1596 if (zpool_read_label(fd, &config) != 0) { 1597 (void) no_memory(hdl); 1598 return (-1); 1599 } 1600 1601 if (config == NULL) 1602 return (0); 1603 1604 verify(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_STATE, 1605 &stateval) == 0); 1606 verify(nvlist_lookup_uint64(config, ZPOOL_CONFIG_GUID, 1607 &vdev_guid) == 0); 1608 1609 if (stateval != POOL_STATE_SPARE && stateval != POOL_STATE_L2CACHE) { 1610 verify(nvlist_lookup_string(config, ZPOOL_CONFIG_POOL_NAME, 1611 &name) == 0); 1612 verify(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_GUID, 1613 &guid) == 0); 1614 } 1615 1616 switch (stateval) { 1617 case POOL_STATE_EXPORTED: 1618 /* 1619 * A pool with an exported state may in fact be imported 1620 * read-only, so check the in-core state to see if it's 1621 * active and imported read-only. If it is, set 1622 * its state to active. 1623 */ 1624 if (pool_active(hdl, name, guid, &isactive) == 0 && isactive && 1625 (zhp = zpool_open_canfail(hdl, name)) != NULL) { 1626 if (zpool_get_prop_int(zhp, ZPOOL_PROP_READONLY, NULL)) 1627 stateval = POOL_STATE_ACTIVE; 1628 1629 /* 1630 * All we needed the zpool handle for is the 1631 * readonly prop check. 1632 */ 1633 zpool_close(zhp); 1634 } 1635 1636 ret = B_TRUE; 1637 break; 1638 1639 case POOL_STATE_ACTIVE: 1640 /* 1641 * For an active pool, we have to determine if it's really part 1642 * of a currently active pool (in which case the pool will exist 1643 * and the guid will be the same), or whether it's part of an 1644 * active pool that was disconnected without being explicitly 1645 * exported. 1646 */ 1647 if (pool_active(hdl, name, guid, &isactive) != 0) { 1648 nvlist_free(config); 1649 return (-1); 1650 } 1651 1652 if (isactive) { 1653 /* 1654 * Because the device may have been removed while 1655 * offlined, we only report it as active if the vdev is 1656 * still present in the config. Otherwise, pretend like 1657 * it's not in use. 1658 */ 1659 if ((zhp = zpool_open_canfail(hdl, name)) != NULL && 1660 (pool_config = zpool_get_config(zhp, NULL)) 1661 != NULL) { 1662 nvlist_t *nvroot; 1663 1664 verify(nvlist_lookup_nvlist(pool_config, 1665 ZPOOL_CONFIG_VDEV_TREE, &nvroot) == 0); 1666 ret = find_guid(nvroot, vdev_guid); 1667 } else { 1668 ret = B_FALSE; 1669 } 1670 1671 /* 1672 * If this is an active spare within another pool, we 1673 * treat it like an unused hot spare. This allows the 1674 * user to create a pool with a hot spare that currently 1675 * in use within another pool. Since we return B_TRUE, 1676 * libdiskmgt will continue to prevent generic consumers 1677 * from using the device. 1678 */ 1679 if (ret && nvlist_lookup_uint64(config, 1680 ZPOOL_CONFIG_IS_SPARE, &isspare) == 0 && isspare) 1681 stateval = POOL_STATE_SPARE; 1682 1683 if (zhp != NULL) 1684 zpool_close(zhp); 1685 } else { 1686 stateval = POOL_STATE_POTENTIALLY_ACTIVE; 1687 ret = B_TRUE; 1688 } 1689 break; 1690 1691 case POOL_STATE_SPARE: 1692 /* 1693 * For a hot spare, it can be either definitively in use, or 1694 * potentially active. To determine if it's in use, we iterate 1695 * over all pools in the system and search for one with a spare 1696 * with a matching guid. 1697 * 1698 * Due to the shared nature of spares, we don't actually report 1699 * the potentially active case as in use. This means the user 1700 * can freely create pools on the hot spares of exported pools, 1701 * but to do otherwise makes the resulting code complicated, and 1702 * we end up having to deal with this case anyway. 1703 */ 1704 cb.cb_zhp = NULL; 1705 cb.cb_guid = vdev_guid; 1706 cb.cb_type = ZPOOL_CONFIG_SPARES; 1707 if (zpool_iter(hdl, find_aux, &cb) == 1) { 1708 name = (char *)zpool_get_name(cb.cb_zhp); 1709 ret = B_TRUE; 1710 } else { 1711 ret = B_FALSE; 1712 } 1713 break; 1714 1715 case POOL_STATE_L2CACHE: 1716 1717 /* 1718 * Check if any pool is currently using this l2cache device. 1719 */ 1720 cb.cb_zhp = NULL; 1721 cb.cb_guid = vdev_guid; 1722 cb.cb_type = ZPOOL_CONFIG_L2CACHE; 1723 if (zpool_iter(hdl, find_aux, &cb) == 1) { 1724 name = (char *)zpool_get_name(cb.cb_zhp); 1725 ret = B_TRUE; 1726 } else { 1727 ret = B_FALSE; 1728 } 1729 break; 1730 1731 default: 1732 ret = B_FALSE; 1733 } 1734 1735 1736 if (ret) { 1737 if ((*namestr = zfs_strdup(hdl, name)) == NULL) { 1738 if (cb.cb_zhp) 1739 zpool_close(cb.cb_zhp); 1740 nvlist_free(config); 1741 return (-1); 1742 } 1743 *state = (pool_state_t)stateval; 1744 } 1745 1746 if (cb.cb_zhp) 1747 zpool_close(cb.cb_zhp); 1748 1749 nvlist_free(config); 1750 *inuse = ret; 1751 return (0); 1752} 1753